Standard Binoculars

In these binoculars, the beam of light (yellow line) is folded by two prisms before it exits at the eyepiece, as shown here. The type of prisms in these binoculars are called Porro prisms. Some binoculars have rubber eye cups on the eyepieces to keep out stray light. Glasses-wearers can push these back to get their eyes closer to the eyepieces.

rubber eye cups can be rolled back if you wear glasses rubber eye cups can be rolled back if you wear glasses

THE MOON THROUGH STANDARD BiNOCULARS

light enters

THE MOON THROUGH STANDARD BiNOCULARS

light enters eyepiece prisms

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